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                <h1 id="1、CSS的使用"><a href="#1、CSS的使用" class="headerlink" title="1、CSS的使用"></a>1、CSS的使用</h1><h2 id="1、css的三种引入方式"><a href="#1、css的三种引入方式" class="headerlink" title="1、css的三种引入方式"></a>1、css的三种引入方式</h2><h3 id="1、行内样式"><a href="#1、行内样式" class="headerlink" title="1、行内样式"></a>1、行内样式</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css">1. 行内样式
    a. <span class="token property">含义</span><span class="token punctuation">:</span> 就是写在当前标签内的样式
    b. 每个标签都有style属性
    	style = <span class="token string">"css样式"</span>
    c. 只对当前的标签起作用

 &lt;span style=<span class="token string">"color:red;font-size:30px"</span>&gt;span1&lt;/span&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<h3 id="2、-内部样式"><a href="#2、-内部样式" class="headerlink" title="2、 内部样式"></a>2、 内部样式</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">2. 内部样式
    a. 含义: 写在当前html中的样式
    b. 在当前html中写一个style标签,在标签内部
    	选择器</span><span class="token punctuation">{</span> css样式 <span class="token punctuation">}</span>
    <span class="token selector">c. 对当前html中的相应标签(选择器决定的)起作用


&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;01-HTML引入CSS&lt;/title&gt;
    &lt;style type="text/css"&gt;
        span</span><span class="token punctuation">{</span>
            <span class="token property">color</span> <span class="token punctuation">:</span> green<span class="token punctuation">;</span>
            <span class="token property">font-size</span><span class="token punctuation">:</span> 40px<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    &lt;/style&gt;
&lt;/head&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="3、-外部样式"><a href="#3、-外部样式" class="headerlink" title="3、 外部样式"></a>3、 外部样式</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">3. 外部样式
    a. 含义: 单独的编写一个css文件,然后引入到html中 (css文件复用性更好,其他html也可以用)
    b. css文件里面: 直接写
    	选择器</span><span class="token punctuation">{</span>css样式<span class="token punctuation">}</span>
    c. 引入到html中
    	&lt;link rel=<span class="token string">"stylesheet"</span> href=<span class="token string">"../css/my.css"</span>&gt;
        1. <span class="token function">rel</span><span class="token punctuation">(</span>relative<span class="token punctuation">)</span> <span class="token property">后面是一个固定值stylesheet</span> <span class="token punctuation">:</span> 声明引入的是一						个css文件
        2. <span class="token property">href</span> <span class="token punctuation">:</span> 链接<span class="token punctuation">,</span>写css文件即可<span class="token punctuation">(</span>远程和本地<span class="token punctuation">)</span>


&lt;head&gt;
    &lt;meta charset=<span class="token string">"UTF-8"</span>&gt;
    &lt;title&gt;01-HTML引入CSS&lt;/title&gt;
 	&lt;link rel=<span class="token string">"stylesheet"</span> href=<span class="token string">"../css/my.css"</span>&gt;
&lt;/head&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>注意：</p>
<ol>
<li>优先级 (基于相同属性,如果不同属性是叠加)<pre><code>            行内样式 &gt; 内部 = 外部</code></pre>
</li>
<li>html页面被浏览器从上至下加载,后加载会覆盖先加载的</li>
<li>style标签和link标签放在html中任意位置,规范放head标签内</li>
<li>style标签的 type属性是可以省略的, 固定值 text/css : 声明当前是css语法</li>
</ol>
<h2 id="2、基本语法"><a href="#2、基本语法" class="headerlink" title="2、基本语法"></a>2、基本语法</h2><pre class="line-numbers language-css" data-language="css"><code class="language-css">    <span class="token property">css语法</span><span class="token punctuation">:</span>
        <span class="token property">css属性名1</span> <span class="token punctuation">:</span> css属性值1<span class="token punctuation">;</span>
        <span class="token property">css属性名2</span> <span class="token punctuation">:</span> css属性值2a css属性值2b css属性值2c<span class="token selector">;

    1. 样式名多个单词用横杠分割 font-size (java 小驼峰: fontSize)
    2. 样式值多个单词用空格分割 border: 1px solid blue (宽度 实线 颜色)
    3. 多个样式之间，以分号分割

&lt;!DOCTYPE html&gt;
&lt;html lang="zh-CN"&gt;
&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;02-CSS语法&lt;/title&gt;
    &lt;style&gt;
        span</span><span class="token punctuation">{</span>
            <span class="token property">color</span> <span class="token punctuation">:</span> red<span class="token punctuation">;</span>
            <span class="token property">border</span><span class="token punctuation">:</span> 1px solid blue<span class="token punctuation">;</span>
            <span class="token property">font-size</span><span class="token punctuation">:</span> 50px
        <span class="token punctuation">}</span>
    &lt;/style&gt;
&lt;/head&gt;

&lt;body&gt;
    &lt;span style=<span class="token string">"font-size: 50px"</span>&gt;样式名多个单词用横杠分割&lt;/span&gt;&lt;br/&gt;
    &lt;span&gt;样式值多个单词用空格分割&lt;/span&gt;&lt;br/&gt;
    &lt;span&gt;多个样式之间，以分号分割&lt;/span&gt;&lt;br/&gt;
&lt;/body&gt;

&lt;/html&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<h2 id="3、选择器"><a href="#3、选择器" class="headerlink" title="3、选择器"></a>3、选择器</h2><ol>
<li>标签选择器</li>
<li>class选择器</li>
<li>id选择器</li>
</ol>
<h3 id="1、标签选择器"><a href="#1、标签选择器" class="headerlink" title="1、标签选择器"></a>1、标签选择器</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">标签名选择器的格式是：

标签名</span><span class="token punctuation">{</span> 
    属性：值<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token selector">span</span><span class="token punctuation">{</span>
    <span class="token property">font-size</span><span class="token punctuation">:</span> 10px<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

&lt;span&gt;马尔扎哈&lt;/span&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<h3 id="2、class选择器"><a href="#2、class选择器" class="headerlink" title="2、class选择器"></a>2、class选择器</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">2. class选择器 -&gt; 类加载器   ：可以用很多次
	1). 每个标签都有class属性,属性值可以重复,而且还可以设置多个值
	2). 语法
        .类选择器名字</span><span class="token punctuation">{</span>

        <span class="token punctuation">}</span>

		<span class="token selector">.female -&gt; 选中class=female的一组标签


.female</span><span class="token punctuation">{</span>
    <span class="token property">color</span> <span class="token punctuation">:</span> green<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

&lt;span class=<span class="token string">"female"</span>&gt;古力娜扎&lt;/span&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<h3 id="3、id选择器"><a href="#3、id选择器" class="headerlink" title="3、id选择器"></a>3、id选择器</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">1. id选择器,只能用一次
	1). 每个标签都有id属性,属性值必须唯一
	2). 语法
		#id值
		#boss -&gt; 选中id=boss的标签
	3). 特点: 一般只选中一个标签

#boss</span><span class="token punctuation">{</span>
    <span class="token property">color</span><span class="token punctuation">:</span>red<span class="token punctuation">;</span>
    <span class="token property">font-size</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

&lt;span id=<span class="token string">"boss"</span>&gt;灭霸&lt;/span&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<h3 id="4、组合（并集）选择器"><a href="#4、组合（并集）选择器" class="headerlink" title="4、组合（并集）选择器"></a>4、组合（并集）选择器</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">组合选择器的格式是： 
	选择器 1，选择器 2，选择器 n</span><span class="token punctuation">{</span>
        属性：值<span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
<span class="token selector">组合选择器可以让多个选择器共用同一个 css 样式代码。

.class01 , #id01，span</span><span class="token punctuation">{</span>
    <span class="token property">color</span><span class="token punctuation">:</span> blue<span class="token punctuation">;</span> 
    <span class="token property">font-size</span><span class="token punctuation">:</span> 20px<span class="token punctuation">;</span> 
    <span class="token property">border</span><span class="token punctuation">:</span> 1px yellow solid<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

&lt;div id=<span class="token string">"id01"</span>&gt;div 标签 class01&lt;/div&gt; &lt;br /&gt; 
&lt;span &gt;span 标签&lt;/span&gt; &lt;br /&gt; 
&lt;div class=<span class="token string">"class01"</span>&gt;div 标签&lt;/div&gt; &lt;br /&gt; 
&lt;div&gt;div 标签 id01&lt;/div&gt; &lt;br /&gt;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<h3 id="5、子类选择器（只找一级子元素）"><a href="#5、子类选择器（只找一级子元素）" class="headerlink" title="5、子类选择器（只找一级子元素）"></a>5、子类选择器（只找一级子元素）</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">语法: 父选择器&gt;子选择器
	此父选择器下的一级子选择器

#mydiv&gt;span</span><span class="token punctuation">{</span>
    <span class="token comment">/*color : blue;*/</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<h3 id="6、子类选择器（找所有子元素）"><a href="#6、子类选择器（找所有子元素）" class="headerlink" title="6、子类选择器（找所有子元素）"></a>6、子类选择器（找所有子元素）</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">层级选择器(多)
	语法: 祖先选择器 子孙选择器 

.y span</span><span class="token punctuation">{</span>
    <span class="token property">color</span> <span class="token punctuation">:</span> green<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="7、属性选择器"><a href="#7、属性选择器" class="headerlink" title="7、属性选择器"></a>7、属性选择器</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">语法: 选择器1[属性名='值']
	此选择器中符合属性条件的标签

input[type='text']</span><span class="token punctuation">{</span>
    <span class="token property">background-color</span><span class="token punctuation">:</span> pink<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<h2 id="4、常用属性"><a href="#4、常用属性" class="headerlink" title="4、常用属性"></a>4、常用属性</h2><h3 id="1、字体与文本"><a href="#1、字体与文本" class="headerlink" title="1、字体与文本"></a>1、字体与文本</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css">字体颜色：color：red；
		<span class="token property">color</span><span class="token punctuation">:</span><span class="token function">rgb</span><span class="token punctuation">(</span>255<span class="token punctuation">,</span>0<span class="token punctuation">,</span>0<span class="token punctuation">)</span>；
		<span class="token property">color</span><span class="token punctuation">:</span>#ff002e；

<span class="token property">文字大小</span><span class="token punctuation">:</span><span class="token property">font-size</span><span class="token punctuation">:</span> 20px<span class="token punctuation">;</span>

<span class="token property">行高</span><span class="token punctuation">:</span><span class="token property">line-height</span><span class="token punctuation">:</span> 40px<span class="token punctuation">;</span>

<span class="token property">字体加粗</span><span class="token punctuation">:</span><span class="token property">font-weight</span><span class="token punctuation">:</span> bold<span class="token punctuation">;</span>

<span class="token property">字体</span><span class="token punctuation">:</span><span class="token property">font-family</span><span class="token punctuation">:</span> 楷体<span class="token punctuation">;</span>

<span class="token property">文字倾斜</span><span class="token punctuation">:</span><span class="token property">font-style</span><span class="token punctuation">:</span> italic<span class="token punctuation">;</span>

<span class="token property">隐藏下划线</span><span class="token punctuation">:</span><span class="token property">text-decoration</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="2、背景属性"><a href="#2、背景属性" class="headerlink" title="2、背景属性"></a>2、背景属性</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"> 背景颜色：  <span class="token property">background-color</span><span class="token punctuation">:</span> pink<span class="token punctuation">;</span>
 背景图片：  <span class="token property">background-image</span><span class="token punctuation">:</span> <span class="token url"><span class="token function">url</span><span class="token punctuation">(</span><span class="token string url">"../img/a.jpg"</span><span class="token punctuation">)</span></span><span class="token punctuation">;</span>
<span class="token property">背景是否重复：peat</span><span class="token punctuation">:</span> no-repeat<span class="token punctuation">;</span>
背景位置偏移：   <span class="token property">background-position</span><span class="token punctuation">:</span> 10px 20px<span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<p>background-position的值可以有一下三种：</p>
<table>
<thead>
<tr>
<th>值</th>
<th>描述</th>
</tr>
</thead>
<tbody><tr>
<td>top left ，top center ，top right， center left ，center center ，center right ，bottom left ，bottom center ，bottom right</td>
<td>如果您仅规定了一个关键词，那么第二个值将是”center”。</td>
</tr>
<tr>
<td>x% y%</td>
<td>第一个值是水平位置，第二个值是垂直位置。<br>左上角是 0% 0%。右下角是 100% 100%<br>如果您仅规定了一个值，另一个值将是 50%。</td>
</tr>
<tr>
<td>xpos ypos(左上角的坐标)</td>
<td>第一个值是水平位置，第二个值是垂直位置<br>左上角是 0 0。单位是像素 (0px 0px) 或任何其他的 CSS 单位。</td>
</tr>
</tbody></table>
<h2 id="5、元素显示（Display-显示-与-Visibility（可见性）"><a href="#5、元素显示（Display-显示-与-Visibility（可见性）" class="headerlink" title="5、元素显示（Display(显示) 与 Visibility（可见性）"></a>5、元素显示（Display(显示) 与 Visibility（可见性）</h2><h3 id="1、display-的值"><a href="#1、display-的值" class="headerlink" title="1、display 的值"></a>1、display 的值</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token property">display</span> <span class="token punctuation">:</span> 展示

    1. <span class="token property">block</span> <span class="token punctuation">:</span> 块级 <span class="token punctuation">(</span>自动换行<span class="token punctuation">)</span> 
		总是独占一行，表现为另起一行开始，而且其后的元素也必须另起一行显示<span class="token punctuation">;</span>
		宽度<span class="token punctuation">(</span>width<span class="token punctuation">)</span>、高度<span class="token punctuation">(</span>height<span class="token punctuation">)</span>、内边距<span class="token punctuation">(</span>padding<span class="token punctuation">)</span>和外边距<span class="token punctuation">(</span>margin<span class="token punctuation">)</span>都可控制

    2. <span class="token property">inline</span> <span class="token punctuation">:</span> 本行 <span class="token punctuation">(</span>不会自动换行<span class="token punctuation">)</span>
	和相邻的内联元素在同一行<span class="token punctuation">;</span>
	宽度<span class="token punctuation">(</span>width<span class="token punctuation">)</span>、高度<span class="token punctuation">(</span>height<span class="token punctuation">)</span>、内边距的top/<span class="token function">bottom</span><span class="token punctuation">(</span>padding-top/padding-bottom<span class="token punctuation">)</span>和外边距的top/<span class="token function">bottom</span><span class="token punctuation">(</span>margin-top/margin-bottom<span class="token punctuation">)</span>都不可改变，就是里面文字或图片的大小<span class="token punctuation">;</span>

    3. <span class="token property">none</span> <span class="token punctuation">:</span> 隐藏，不占位置
	4. inline-block 行内块，表现为同行显示并可修改宽高内外边距等属性<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="2、常见标签的类别"><a href="#2、常见标签的类别" class="headerlink" title="2、常见标签的类别"></a>2、常见标签的类别</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css">常见标签的类别：

块级元素主要有：
 address <span class="token punctuation">,</span> blockquote <span class="token punctuation">,</span> center <span class="token punctuation">,</span> dir <span class="token punctuation">,</span> div <span class="token punctuation">,</span> dl <span class="token punctuation">,</span> fieldset <span class="token punctuation">,</span> form <span class="token punctuation">,</span> h1 <span class="token punctuation">,</span> h2 <span class="token punctuation">,</span> h3 <span class="token punctuation">,</span> h4 <span class="token punctuation">,</span> h5 <span class="token punctuation">,</span> h6 <span class="token punctuation">,</span> hr <span class="token punctuation">,</span> isindex <span class="token punctuation">,</span> menu <span class="token punctuation">,</span> noframes <span class="token punctuation">,</span> noscript <span class="token punctuation">,</span> ol <span class="token punctuation">,</span> p <span class="token punctuation">,</span> pre <span class="token punctuation">,</span> table <span class="token punctuation">,</span> ul <span class="token punctuation">,</span> li

内联元素主要有：
a <span class="token punctuation">,</span> abbr <span class="token punctuation">,</span> acronym <span class="token punctuation">,</span> b <span class="token punctuation">,</span> bdo <span class="token punctuation">,</span> big <span class="token punctuation">,</span> br <span class="token punctuation">,</span> cite <span class="token punctuation">,</span> code <span class="token punctuation">,</span> dfn <span class="token punctuation">,</span> em <span class="token punctuation">,</span> font <span class="token punctuation">,</span> i <span class="token punctuation">,</span> img <span class="token punctuation">,</span> input <span class="token punctuation">,</span> kbd <span class="token punctuation">,</span> label <span class="token punctuation">,</span> q <span class="token punctuation">,</span> s <span class="token punctuation">,</span> samp <span class="token punctuation">,</span> select <span class="token punctuation">,</span> small <span class="token punctuation">,</span> span <span class="token punctuation">,</span> strike <span class="token punctuation">,</span> strong <span class="token punctuation">,</span> sub <span class="token punctuation">,</span> sup <span class="token punctuation">,</span>textarea <span class="token punctuation">,</span> tt <span class="token punctuation">,</span> u <span class="token punctuation">,</span> var

可变元素<span class="token punctuation">(</span>根据上下文关系确定该元素是块元素还是内联元素<span class="token punctuation">)</span>：
applet <span class="token punctuation">,</span>button <span class="token punctuation">,</span>del <span class="token punctuation">,</span>iframe <span class="token punctuation">,</span> ins <span class="token punctuation">,</span>map <span class="token punctuation">,</span>object <span class="token punctuation">,</span> script<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="3、visibility-hidden与display-none的区别"><a href="#3、visibility-hidden与display-none的区别" class="headerlink" title="3、visibility: hidden与display:none的区别"></a>3、<strong>visibility: hidden</strong>与<strong>display:none</strong>的区别</h3><pre class="line-numbers language-css" data-language="css"><code class="language-css">1<span class="token property">、display</span><span class="token punctuation">:</span>none 元素不再占用空间。
2<span class="token property">、visibility</span><span class="token punctuation">:</span> hidden 使元素在网页上不可见，但仍占用空间。<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>



<h2 id="6、盒子模型"><a href="#6、盒子模型" class="headerlink" title="6、盒子模型"></a>6、盒子模型</h2><h3 id="1、概述"><a href="#1、概述" class="headerlink" title="1、概述"></a>1、概述</h3><p><img src="https://www.runoob.com/images/box-model.gif"></p>
<pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">div</span> <span class="token punctuation">{</span>
    <span class="token property">width</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span><span class="token punctuation">(</span>内容的宽度<span class="token punctuation">)</span>
    <span class="token property">height</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span><span class="token punctuation">(</span>内容的高度<span class="token punctuation">)</span>
    <span class="token property">border</span><span class="token punctuation">:</span> 25px solid green<span class="token punctuation">;</span>
    <span class="token property">padding</span><span class="token punctuation">:</span> 25px<span class="token punctuation">;</span>
    <span class="token property">margin</span><span class="token punctuation">:</span> 25px<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

300px <span class="token punctuation">(</span>宽<span class="token punctuation">)</span>
+ 50px <span class="token punctuation">(</span>左 + 右填充<span class="token punctuation">)</span>
+ 50px <span class="token punctuation">(</span>左 + 右边框<span class="token punctuation">)</span>
+ 50px <span class="token punctuation">(</span>左 + 右边距<span class="token punctuation">)</span>
= 450px 并非300px

总元素的宽度=宽度+左填充+右填充+左边框+右边框+左边距+右边距
总元素的高度=高度+顶部填充+底部填充+上边框+下边框+上边距+下边距<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p><img src="https://gitee.com/ergou15154/drawing-bed/raw/master/source/image-20210828115240179.png" alt="image-20210828115240179"></p>
<h3 id="2、padding和margin"><a href="#2、padding和margin" class="headerlink" title="2、padding和margin"></a>2、padding和margin</h3><p><img src="https://www.runoob.com/wp-content/uploads/2013/08/VlwVi.png"></p>
<pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token property">margin-top</span><span class="token punctuation">:</span>100px<span class="token punctuation">;</span>
<span class="token property">margin-bottom</span><span class="token punctuation">:</span>100px<span class="token punctuation">;</span>
<span class="token property">margin-right</span><span class="token punctuation">:</span>50px<span class="token punctuation">;</span>
<span class="token property">margin-left</span><span class="token punctuation">:</span>50px<span class="token punctuation">;</span>

顺时针
<span class="token property">margin</span><span class="token punctuation">:</span>25px 50px 75px 100px<span class="token punctuation">;</span>
上边距为25px
右边距为50px
下边距为75px
左边距为100px

<span class="token property">margin</span><span class="token punctuation">:</span>25px 50px 75px<span class="token punctuation">;</span>
上边距为25px
左右边距为50px
下边距为75px

<span class="token property">margin</span><span class="token punctuation">:</span>25px 50px<span class="token punctuation">;</span>
上下边距为25px
左右边距为50px

<span class="token property">margin</span><span class="token punctuation">:</span>25px<span class="token punctuation">;</span>
所有的4个边距都是25px<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>值可以为：auto（padding不可用），length（使用像素，pt，em等），%（百分比）</p>
<h2 id="7、定位：Position"><a href="#7、定位：Position" class="headerlink" title="7、定位：Position"></a>7、定位：Position</h2><p>position 属性的五个值：</p>
<ul>
<li><a target="_blank" rel="noopener" href="https://www.runoob.com/css/css-positioning.html#position-static">static</a></li>
<li><a target="_blank" rel="noopener" href="https://www.runoob.com/css/css-positioning.html#position-relative">relative</a></li>
<li><a target="_blank" rel="noopener" href="https://www.runoob.com/css/css-positioning.html#position-fixed">fixed</a></li>
<li><a target="_blank" rel="noopener" href="https://www.runoob.com/css/css-positioning.html#position-absolute">absolute</a></li>
<li>sticky</li>
</ul>
<h3 id="1、static-定位"><a href="#1、static-定位" class="headerlink" title="1、static 定位"></a>1、static 定位</h3><p>HTML 元素的默认值，即没有定位，遵循正常的文档流对象。</p>
<p>静态定位的元素不会受到 top, bottom, left, right影响。</p>
<pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">元素也可以基于它们的类而被选择
&lt;div class="fancy"&gt;

div.static</span> <span class="token punctuation">{</span>
    <span class="token property">position</span><span class="token punctuation">:</span> static<span class="token punctuation">;</span>
    <span class="token property">border</span><span class="token punctuation">:</span> 3px solid #73AD21<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="2、fixed-定位"><a href="#2、fixed-定位" class="headerlink" title="2、fixed 定位"></a>2、fixed 定位</h3><p>元素的位置相对于浏览器窗口是固定位置。即使窗口是滚动的它也不会移动：</p>
<p>Fixed定位使元素的位置与文档流无关，因此不占据空间。</p>
<p>Fixed定位的元素和其他元素重叠。</p>
<pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">p.pos_fixed</span>
<span class="token punctuation">{</span>
    <span class="token property">position</span><span class="token punctuation">:</span>fixed<span class="token punctuation">;</span>
    <span class="token property">top</span><span class="token punctuation">:</span>30px<span class="token punctuation">;</span>
    <span class="token property">right</span><span class="token punctuation">:</span>5px<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="3、relative（相对）-定位"><a href="#3、relative（相对）-定位" class="headerlink" title="3、relative（相对） 定位"></a>3、relative（相对） 定位</h3><p>相对定位元素的定位是相对其正常位置。</p>
<p>相对定位元素经常被用来作为绝对定位元素的容器块。</p>
<pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">h2.pos_top</span>
<span class="token punctuation">{</span>
    <span class="token property">position</span><span class="token punctuation">:</span>relative<span class="token punctuation">;</span>
    <span class="token property">top</span><span class="token punctuation">:</span>-50px<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="4、absolute（绝对）-定位"><a href="#4、absolute（绝对）-定位" class="headerlink" title="4、absolute（绝对） 定位"></a>4、absolute（绝对） 定位</h3><p>绝对定位的元素的位置相对于最近的已定位父元素（属性中有position的，不包含static），如果元素没有已定位的父元素，那么它的位置相对于  <strong>html</strong> :</p>
<p>absolute 定位使元素的位置与文档流无关，因此不占据空间。</p>
<p>absolute 定位的元素和其他元素重叠。</p>
<pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">h2</span>
<span class="token punctuation">{</span>
    <span class="token property">position</span><span class="token punctuation">:</span>absolute<span class="token punctuation">;</span>
    <span class="token property">left</span><span class="token punctuation">:</span>100px<span class="token punctuation">;</span>
    <span class="token property">top</span><span class="token punctuation">:</span>150px<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="5、sticky-定位"><a href="#5、sticky-定位" class="headerlink" title="5、sticky 定位"></a>5、sticky 定位</h3><p>粘性定位的元素是依赖于用户的滚动，在 <strong>position:relative</strong> 与 <strong>position:fixed</strong> 定位之间切换。</p>
<p>元素定位表现为在跨越特定阈值前为相对定位，之后为固定定位。</p>
<p>这个特定阈值指的是 top, right, bottom 或 left 之一，换言之，指定 top, right, bottom 或 left 四个阈值其中之一，才可使粘性定位生效。否则其行为与相对定位相同。</p>
<pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">div.sticky</span> <span class="token punctuation">{</span>
    <span class="token property">position</span><span class="token punctuation">:</span> -webkit-sticky<span class="token punctuation">;</span> <span class="token comment">/* Safari */</span>
    <span class="token property">position</span><span class="token punctuation">:</span> sticky<span class="token punctuation">;</span>
    <span class="token property">top</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
    <span class="token property">background-color</span><span class="token punctuation">:</span> green<span class="token punctuation">;</span>
    <span class="token property">border</span><span class="token punctuation">:</span> 2px solid #4CAF50<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>





<p><strong>先后顺序问题：</strong>z-index</p>
<pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">img</span>
<span class="token punctuation">{</span>
    <span class="token property">position</span><span class="token punctuation">:</span>absolute<span class="token punctuation">;</span>
    <span class="token property">left</span><span class="token punctuation">:</span>0px<span class="token punctuation">;</span>
    <span class="token property">top</span><span class="token punctuation">:</span>0px<span class="token punctuation">;</span>
    <span class="token property">z-index</span><span class="token punctuation">:</span>-1<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

具有更高堆叠顺序的元素总是在较低的堆叠顺序元素的前面。
给定 z-index 的值为层级的值。（不给默认为0）
a. 层级为0的盒子，也比标准流和浮动高。
b. 层级为负数的盒子，比标准流和浮动低。
浮动或者标准流的盒子，后面的盒子比前面的层级高。<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<pre class="line-numbers language-none"><code class="language-none">
标准流盒子，低于浮动的盒子，浮动的盒子又低于定位的盒子。

定位高于浮动，浮动高于标准流。（高低和占不占位置无关）<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="8、float浮动"><a href="#8、float浮动" class="headerlink" title="8、float浮动"></a>8、float浮动</h2><p>打破常规，让div也能变小（实际大小跟 宽和高）变成类似行内块元素。</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>zh-CN<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>UTF-8<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>09-浮动属性<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</span></span><span class="token style"><span class="token language-css">
        <span class="token selector">div</span><span class="token punctuation">{</span>
            <span class="token property">border</span><span class="token punctuation">:</span> 1px red solid<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 200px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 200px<span class="token punctuation">;</span>
            <span class="token property">float</span><span class="token punctuation">:</span> right<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>1<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>2<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>3<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>4<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>5<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>6<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="9、伪类选择器"><a href="#9、伪类选择器" class="headerlink" title="9、伪类选择器"></a>9、伪类选择器</h2><pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>zh-CN<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>UTF-8<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Title<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token comment">&lt;!--
       伪类选择器: 选中某种状态的标签

       观察:
           未点击:  蓝色  (link)
           鼠标移上去:  蓝色 (hover : 悬浮)
           点击:  红色 (active: 激活)
           访问过后:  紫色 (visited: 访问过后)
       修改
   --&gt;</span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</span></span><span class="token style"><span class="token language-css">
        <span class="token selector">a:link</span><span class="token punctuation">{</span>
            <span class="token property">color</span><span class="token punctuation">:</span>deeppink<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token selector">a:hover</span><span class="token punctuation">{</span>
            <span class="token property">color</span><span class="token punctuation">:</span>yellow<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token selector">a:active</span><span class="token punctuation">{</span>
            <span class="token property">color</span><span class="token punctuation">:</span>red<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token selector">a:visited</span><span class="token punctuation">{</span>
            <span class="token property">color</span><span class="token punctuation">:</span>grey<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token selector">a</span><span class="token punctuation">{</span>
            <span class="token property">text-decoration</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#0<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>百度一下<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#0<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>百度一下<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#1<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>百度一下<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#2<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>百度一下<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#3<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>百度一下<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#4<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>百度一下<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>


                
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